fix the regression on merging configmap with different namespace

pkg/ifc/ifc.go

@@ -57,6 +57,7 @@ type Kunstructured interface {
 	GetKind() string
 	GetName() string
 	SetName(string)
+	SetNamespace(string)
 	GetLabels() map[string]string
 	SetLabels(map[string]string)
 	GetAnnotations() map[string]string

pkg/resource/resource.go

@@ -42,6 +42,7 @@ func (r *Resource) Replace(other *Resource) {
 	r.SetAnnotations(
 		mergeStringMaps(other.GetAnnotations(), r.GetAnnotations()))
 	r.SetName(other.GetName())
+	r.SetNamespace(other.GetNamespace())
 	r.copyOtherFields(other)
 }
 

pkg/target/namespacedgenerators_test.go

@@ -87,3 +87,43 @@ metadata:
 type: Opaque
 `)
 }
+
+func TestNamespacedGeneratorWithOverlays(t *testing.T) {
+	th := kusttest_test.NewKustTestHarness(t, "/app/overlay")
+	th.WriteK("/app/base", `
+namespace: base
+
+configMapGenerator:
+- name: testCase
+  literals:
+    - base=true
+`)
+	th.WriteK("/app/overlay", `
+resources:
+  - ../base
+
+namespace: overlay
+
+configMapGenerator:
+  - name: testCase
+    behavior: merge
+    literals:
+      - overlay=true
+`)
+	m, err := th.MakeKustTarget().MakeCustomizedResMap()
+	if err != nil {
+		t.Fatalf("Err: %v", err)
+	}
+	th.AssertActualEqualsExpected(m, `
+apiVersion: v1
+data:
+  base: "true"
+  overlay: "true"
+kind: ConfigMap
+metadata:
+  annotations: {}
+  labels: {}
+  name: testCase-4g75kbk6gm
+  namespace: overlay
+`)
+}